Supported a complete jump_label implementation based on the ARM64 and
RV64 version and add the CONFIG_JUMP_LABEL=y to the defconfig.
Testing was conducted using a dedicated test module jump-label-test,
provided in the link below. For detailed steps, please refer to the
README also at the provided link.
Link: https://github.com/ChenMiaoi/GSoC-2025-Final-Report/tree/main/tests/jump-label-test
Test Environment:
- Hardware: QEMU emulated OR1K
- Kernel Version: 6.17.0-rc3-dirty
- Configs: CONFIG_MODULES=y,CONFIG_MODULE_UNLOAD=y
- Toolchain: or1k-none-linux-musl-gcc 15.1.0
Test Results:
$ insmod jump_label_test.ko
[ 32.590000] Jump label performance test module loaded
[ 35.250000] Normal branch time: 1241327150 ns (124 ns per iteration)
[ 35.250000] Jump label (false) time: 706422700 ns (70 ns per iteration)
[ 35.250000] Jump label (true) time: 708913450 ns (70 ns per iteration)
$ rmmod jump_label_test.ko
[ 72.210000] Jump label test module unloaded
The results show approximately 43% improvement in branch performance
when using jump labels compared to traditional branches.
Link: https://lore.kernel.org/openrisc/aLsZ9S3X0OpKy1RM@antec/T/#u
Signed-off-by: chenmiao <chenmiao.ku@gmail.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Add cacheinfo support for OpenRISC.
Currently, a few CPU cache attributes pertaining to OpenRISC processors
are exposed along with other unrelated CPU attributes in the procfs file
system (/proc/cpuinfo). However, a few cache attributes remain unexposed.
Provide a mechanism that the generic cacheinfo infrastructure can employ
to expose these attributes via the sysfs file system. These attributes
can then be exposed in /sys/devices/system/cpu/cpuX/cache/indexN. Move
the implementation to pull cache attributes from the processor's
registers from arch/openrisc/kernel/setup.c with a few modifications.
This implementation is based on similar work done for MIPS and LoongArch.
Link: https://raw.githubusercontent.com/openrisc/doc/master/openrisc-arch-1.4-rev0.pdf
Signed-off-by: Sahil Siddiq <sahilcdq0@gmail.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
The "cpuinfo_or1k" structure currently has identical data members for
different cache components.
Remove these fields out of struct cpuinfo_or1k and into its own struct.
This reduces duplication while keeping cpuinfo_or1k extensible so more
cache descriptors can be added in the future.
Also add a new field "sets" to the new structure.
Signed-off-by: Sahil Siddiq <sahilcdq0@gmail.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
The unflatten_and_copy_device_tree() function contains a call to
memblock_alloc(). This means that memblock is allocating memory before
any of the reserved memory regions are set aside in the setup_memory()
function which calls early_init_fdt_scan_reserved_mem(). Therefore,
there is a possibility for memblock to allocate from any of the
reserved memory regions.
Hence, move the call to setup_memory() to be earlier in the init
sequence so that the reserved memory regions are set aside before any
allocations are done using memblock.
Signed-off-by: Oreoluwa Babatunde <quic_obabatun@quicinc.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
The common of_get_cpu_node() is equivalent to setup_find_cpu_node(), so
use it instead.
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This was pointed out with the recent name change of or32_early_setup to
or1k_early_setup. Investigating the file I found a few other warnings
so cleaning them up here.
arch/openrisc/kernel/setup.c:220:13: warning: no previous prototype for 'or1k_early_setup' [-Wmissing-prototypes]
220 | void __init or1k_early_setup(void *fdt)
| ^~~~~~~~~~~~~~~~
Fix this the missing or1k_early_setup prototype warning by adding an
asm/setup.h file to define the prototype.
arch/openrisc/kernel/setup.c:246:13: warning: no previous prototype for 'detect_unit_config' [-Wmissing-prototypes]
246 | void __init detect_unit_config(unsigned long upr, unsigned long mask,
| ^~~~~~~~~~~~~~~~~~
The function detect_unit_config is not used, just remove it.
arch/openrisc/kernel/setup.c:221: warning: Function parameter or member 'fdt' not described in 'or1k_early_setup'
Add @fdt docs to the function comment to suppress this warning.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
'setup_find_cpu_node()' take a reference on the node it returns.
This reference must be decremented when not needed anymore, or there will
be a leak.
Add the missing 'of_node_put(cpu)'.
Note that 'setup_cpuinfo()' that also calls this function already has a
correct 'of_node_put(cpu)' at its end.
Fixes: 9d02a4283e ("OpenRISC: Boot code")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Recently OpenRISC added support for external initrd images, but I found
some instability when using larger buildroot initrd images. It turned
out that I forgot to reserve the memblock space for the initrd image.
This patch fixes the instability issue by reserving memblock space.
Fixes: ff6c923dbe ("openrisc: Add support for external initrd images")
Signed-off-by: Stafford Horne <shorne@gmail.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
In OpenRISC we set the initrd_start and initrd_end based on the symbols
we setup in vmlinux.lds.S. However, this is not needed if we use the
generic linker description in INIT_DATA_SECTION.
Removing our own initrd setup reduces code, but also the generic code
supports loading external initrd images. A bootloader can load a rootfs
image into memory and we can configure devicetree to load it with:
chosen {
bootargs = "earlycon";
stdout-path = "uart0:115200";
linux,initrd-start = < 0x08000100 >;
linux,initrd-end = < 0x08200000 >;
};
Reported-by: Mateusz Holenko <mholenko@antmicro.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Based on 1 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 3029 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
A few architectures use <asm/segment.h> internally, but nothing in
common code does. Remove all the empty or almost empty versions of it,
including the asm-generic one.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Use the for_each_of_cpu_node iterator to iterate over cpu nodes. This
has the side effect of defaulting to iterating using "cpu" node names in
preference to the deprecated (for FDT) device_type == "cpu".
This also fixes a leaked reference for cpus node.
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: openrisc@lists.librecores.org
Acked-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This patch introduces the SMP support for the OpenRISC architecture.
The SMP architecture requires cores which have multi-core features which
have been introduced a few years back including:
- New SPRS SPR_COREID SPR_NUMCORES
- Shadow SPRs
- Atomic Instructions
- Cache Coherency
- A wired in IPI controller
This patch adds all of the SMP specific changes to core infrastructure,
it looks big but it needs to go all together as its hard to split this
one up.
Boot loader spinning of second cpu is not supported yet, it's assumed
that Linux is booted straight after cpu reset.
The bulk of these changes are trivial changes to refactor to use per cpu
data structures throughout. The addition of the smp.c and changes in
time.c are the changes. Some specific notes:
MM changes
----------
The reason why this is created as an array, and not with DEFINE_PER_CPU
is that doing it this way, we'll save a load in the tlb-miss handler
(the load from __per_cpu_offset).
TLB Flush
---------
The SMP implementation of flush_tlb_* works by sending out a
function-call IPI to all the non-local cpus by using the generic
on_each_cpu() function.
Currently, all flush_tlb_* functions will result in a flush_tlb_all(),
which has always been the behaviour in the UP case.
CPU INFO
--------
This creates a per cpu cpuinfo struct and fills it out accordingly for
each activated cpu. show_cpuinfo is also updated to reflect new version
information in later versions of the spec.
SMP API
-------
This imitates the arm64 implementation by having a smp_cross_call
callback that can be set by set_smp_cross_call to initiate an IPI and a
handle_IPI function that is expected to be called from an IPI irqchip
driver.
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
[shorne@gmail.com: added cpu stop, checkpatch fixes, wrote commit message]
Signed-off-by: Stafford Horne <shorne@gmail.com>
Motivation for this is to be able to print the way information
properly in print_cpuinfo(), instead of hardcoding it to one.
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Signed-off-by: Jonas Bonn <jonas@southpole.se>
[shorne@gmail.com fixed conflict with show_cpuinfo change]
Signed-off-by: Stafford Horne <shorne@gmail.com>
The openrisc.net domain expired and was taken over by squatters.
These updates point documentation to the new domain, mailing lists
and git repos.
Also, Jonas is not the main maintainer anylonger, he reviews changes
but does not maintain a repo or sent pull requests. Updating this to
add Stafford and Stefan who are the active maintainers.
Acked-by: Olof Kindgren <olof.kindgren@gmail.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Clearing out one todo item. Use the memblock boot time memory
which is the current standard.
Tested-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jonas <jonas@southpole.se>
Signed-off-by: Stafford Horne <shorne@gmail.com>
The of_platform_populate call in the openrisc arch code is now redundant
as the DT core provides a default call. Openrisc has a NULL match table
which means only top level nodes with compatible strings will have
devices creates. The default version will also descend nodes in the
match table such as "simple-bus" which should be fine as openrisc
doesn't have any of these (though it is preferred that memory-mapped
peripherals be grouped under a bus node(s)).
Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Jonas Bonn <jonas@southpole.se>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Stafford Horne <shorne@gmail.com>
The seq_printf return value, because it's frequently misused,
will eventually be converted to void.
See: commit 1f33c41c03 ("seq_file: Rename seq_overflow() to
seq_has_overflowed() and make public")
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Jonas Bonn <jonas@southpole.se>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull OpenRISC updates from Jonas Bonn:
- small cleanups to make allmodconfig pass
- defconfig refresh
- a handful of code sanitization patches
* tag 'for-3.13' of git://git.openrisc.net/~jonas/linux:
openrisc: Refactor or32_early_setup()
openrisc: Remove unused declaration of __initramfs_start
openrisc: Use the declarations provided by <asm/sections.h>
openrisc: Refresh or1ksim_defconfig for v3.12
openrisc: Refactor 16-bit constant relocation
openrisc: include: asm: Kbuild: add default "vga.h"
openrisc: Makefile: append "-D__linux__" to KBUILD_CFLAGS
